129512568 has 32 divisors (see below), whose sum is σ = 326338560. Its totient is φ = 42829920.

The previous prime is 129512561. The next prime is 129512587. The reversal of 129512568 is 865215921.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129512561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18198 + ... + 24293.

It is an arithmetic number, because the mean of its divisors is an integer number (10198080).

Almost surely, 2^129512568 is an apocalyptic number.

It is an amenable number.

129512568 is an abundant number, since it is smaller than the sum of its proper divisors (196825992).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129512568 is a wasteful number, since it uses less digits than its factorization.

129512568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42627 (or 42623 counting only the distinct ones).

The product of its digits is 43200, while the sum is 39.

The square root of 129512568 is about 11380.3588695612. The cubic root of 129512568 is about 505.9457726470.

The spelling of 129512568 in words is "one hundred twenty-nine million, five hundred twelve thousand, five hundred sixty-eight".